Improvement in machines for grinding cotton-cards



UNITED STATES PATENT OFFICE. z tff NATHANIEL SMITH AND ASA ORANDALL, OF NORTH KINGSTON, RHODE ISLAND.

IMPROVEMENT IN MACHINES FoRcRINDINc coTToN-CARDS.'

Specification forming part of Letters Patent No. 170,643, dated March 14, 1854.

T0 all whom. it may concern.:

Be it known that we, NATHANIEL SMITH and ASA CRANDALL, of North Kingston, in the county of Tashington and State of Rhode Island, have invented a new and useful Machine for Grinding Cotton-Cards; and we do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accom panying'drawings, forming part of this specification, in which- Figure l is a side elevation of the machine.

Fig. 2 is an end elevation of the same.l Fig. 3 is a broken longitudinal section, and Fig. 4 is a vertical transverse'section of the machine as in operation. A card-cylinder is represented as being subjected to the grinding process.

Wherever the same letters ,of reference occur in the several figures they are intended to indicate corresponding parts.

The nature of our invention consists in the employment of a narrow emery roller made to traverse back and forth on a horizontal right and left or endless screw from one end of the card-cylinder to the other, and simultaneous therewith to describe vertical circles, and thereby caused to operate in a parallel line with the carding-cylinder upon the whole face of the card and gradually and effectually grind the teeth of the same to a perfect uniformity in length and give them the proper finish. By the employment of this narrow einery roller in the manner herein stated we are enabled to dispense with the necessity of employing broad emery grinders of greater length than the cardingcylinders, which grinders are expensive and difficult to Inake, owing to their great length and the time and pains required vto make them true and itfor performing the very particular duty assigned them. NVe are also enabled, it must be evident, with this narrow traversing grinder to face the cards more truly and give them a more perfect finish than with the broad heavy elnery grinders now in use, which are not always so regular in their action (owing to the almost impossibility of at all times ,getting so long a cylinder perfectly true) as a narrow grinder, which can always be made true with very little trouble and expense and be made to traverse gradually in a horizontal line and rapidly in a vertical direction the whole surface of the cylinder.

To enable others to understand more plainly the construction and `operation of our invention', we will proceed to describe it more minutely. l Y

A represents the emery roller, it being hung perfectly true on the endless screw B, which serves as its shaft, as seen in Figs. 1,3, and 4, and is keyed loosely on the same, it being thus keyed so that it may not t-urn independentof the screw, and also that it may have Yfreedom to move horizontally over the key a and screwjB 'simultaneous with its-vertical movement in the path of a circle. The roller or grinder A is made hollow and forms a circular chamber on its inside,in which aweight O is hung loosely, it having its bearing on the shoulders b or collars b, cast on the inside of the heads c c of the grinding-roller A, as seen in Figs. 3 and 4. In this weight a forked 1ever or shifter D is secured or attached by a universal joint d, as seen in Figs. 3 and et.

commences to traverse in another direction,

carrying with it the grinding-cylinder, the screw giving it -a vertical revolving movement simultaneous with its horizontal traverse.

The weight C is employed for keeping the shifter always in the position shown in the drawings, this weight always adjusting itself and retaining its position under the screw while the card-grinden revolves freely. The collars e e of this weight turn loosely on the shoulders b l) of the card-grinder. ConsequentlyY the weight is caused by gravity to adjust itself and remain in the position shown .in Figs. and 4E. Itis by this weight retaining its position that the actioriof the pronged lever or shifter is rendered effectual in feeding the grinder forward and capable of shifting the direction of the traverse of the same.

E E are standards or bearings for the screw B to rest and turn in. These standards are made adjustable by the set-screws F F, they i i r back and forward traverse to said grinder, and serves also as a shaft for it to hang-and move upon While grinding the cards, the Whole being constructed, arranged, and operating essentially as and for the purpose herein described. v

NATHAN IEL SMITH. ASA CRANDALL.

fitnessesr SYLVESTER G. SPENCER, MARY E. SHEARMAN. 

